Cold water. When steaming buckwheat noodles enema, using hot water will make the water boil very quickly, so that the middle part of buckwheat noodles enema will not be cooked thoroughly, which will lead to diarrhea after eating, so cold water should be used to steam buckwheat noodles enema. Buckwheat noodles enema is a traditional snack popular in Qixian, Taigu, Yushe and Wenshui areas of Shanxi Province.